BIIB
BIOGEN INC.D4515-min delayed · EOD close220.83 −1.64% downas of 2026-09-04mkt cap $32.6B
Biological Products, (No Diagnostic Substances) · SIC 2836 · CIK 0000875045
Who’s trading BIIB
Corporate insiders on Form 4, House members under the STOCK Act, and the funds reporting a position in their 13F.
Corporate insiders
none
no Form 4 filings on record
Congress
4 buys · 3 sells
$32K bought · $49K sold, at range midpoints
Funds holding
2 filers
$107.2M reported
The counts above are free. Who they are, and what each of them traded, is part of Pro — see what it includes.
Form 4 insider trades are exact and filed within two business days. Congressional figures are range midpoints disclosed up to 45 days after the trade, and 13F positions are a quarter-end snapshot. All three are a record of what was disclosed, not a signal.